Add 21/18 and 8/7
1st number: 1 3/18, 2nd number: 1 1/7
21/18 + 8/7 is 97/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 7 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 18 × 7 = 126,
21/18 = 21 × 7/18 × 7 = 147/126 - Likewise, for the 2nd fraction, since 7 × 18 = 126,
8/7 = 8 × 18/7 × 18 = 144/126 - Add the two like fractions:
147/126 + 144/126 = 147 + 144/126 = 291/126 - 291/126 simplified gives 97/42
- So, 21/18 + 8/7 = 97/42
In mixed form: 213/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/18+8/7 21/18+16/7 21/36+8/7 21/18+8/14 63/18+8/7 21/18+24/7 21/54+8/7 21/18+8/21 21/18+40/7 21/90+8/7 21/18+8/35 21/18+56/7 21/18+8/49